Compress Images Online | CompressorJPG
:root{--navy:#12305b;--blue:#2563eb;--blue-dark:#1d4ed8;--border:#d8e0eb;--muted:#64748b;--background:#f4f7fb;--white:#fff;--green:#15803d;--red:#dc2626}
*{box-sizing:border-box}
body{margin:0;background:var(--background);color:#172033;font-family:Arial,Helvetica,sans-serif;line-height:1.5}
button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.48;cursor:not-allowed}
.site-header{background:var(--white);border-bottom:1px solid var(--border)}
.header-inner{max-width:1180px;margin:auto;padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{font-size:23px;font-weight:800;color:var(--navy);text-decoration:none}.logo span{color:var(--blue)}.header-tagline{color:var(--muted);font-size:13px}
main{max-width:1180px;margin:0 auto;padding:35px 20px 55px}
.tool-shell{background:#fff;border:1px solid #cbd5e1;border-radius:18px;padding:25px;box-shadow:0 8px 30px rgba(18,48,91,.06)}
.hero{text-align:center;margin:0 0 27px;padding:0 8px}
.hero h1{color:var(--navy);font-size:clamp(28px,4vw,39px);line-height:1.2;margin:0 0 12px}
.hero p{color:var(--muted);margin:0 auto;max-width:690px}
.panel-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:stretch;gap:20px}
.panel{border:1px solid var(--border);border-radius:13px;background:#fff;padding:22px;min-width:0;display:flex;flex-direction:column;min-height:470px}
.panel h2{margin:0 0 5px;color:var(--navy);font-size:20px}.panel-intro{margin:0 0 19px;color:var(--muted);font-size:13px}
.drop-zone{border:2px dashed #b6c6dc;border-radius:12px;background:#f8fbff;padding:29px 15px;text-align:center;transition:.2s;cursor:pointer}
.drop-zone.dragover{background:#eaf2ff;border-color:var(--blue)}.upload-icon{font-size:37px;margin-bottom:7px}.drop-zone strong{display:block;color:var(--navy)}.drop-zone p{margin:5px 0 13px;color:var(--muted);font-size:13px}.file-types{font-size:12px;color:var(--muted);margin-top:10px}
.btn{border:0;border-radius:8px;padding:11px 16px;font-weight:700;transition:background .15s,transform .15s}.btn:active:not(:disabled){transform:translateY(1px)}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover:not(:disabled){background:var(--blue-dark)}.btn-secondary{background:#eaf0f8;color:var(--navy)}.btn-secondary:hover:not(:disabled){background:#dce6f3}.btn-outline{background:#fff;border:1px solid var(--border);color:#334155}.btn-outline:hover:not(:disabled){background:#f8fafc}.btn-small{padding:7px 10px;font-size:12px}.full-width{width:100%}.file-input{display:none}
.upload-stats{display:flex;justify-content:space-between;gap:10px;margin:16px 0 10px;font-size:13px;color:var(--muted)}
.image-list{display:grid;gap:10px;margin-top:4px}.image-item{display:grid;grid-template-columns:58px minmax(0,1fr) auto;align-items:center;gap:11px;padding:10px;border:1px solid #e5eaf1;border-radius:10px;min-width:0}
.image-thumb{width:58px;height:58px;border-radius:7px;object-fit:cover;background:#f1f5f9}.image-name{font-size:13px;font-weight:700;overflow-wrap:anywhere}.image-meta{color:var(--muted);font-size:11px;margin-top:3px}.image-status{font-size:11px;color:var(--green);margin-top:3px}.remove-btn{border:0;background:transparent;color:var(--red);font-size:20px;padding:3px 7px}.empty-list{color:var(--muted);text-align:center;padding:17px 8px;border:1px dashed #e2e8f0;border-radius:9px;font-size:13px}
.settings-form{display:flex;flex-direction:column;gap:16px;flex:1}.field label{display:block;font-size:13px;font-weight:700;color:#334155;margin-bottom:6px}.field input[type=number],.field select{width:100%;min-height:42px;padding:9px 11px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:#172033;outline:none}.field input:focus,.field select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:12px}.range-line{display:flex;align-items:center;gap:12px}.range-line input{width:100%;accent-color:var(--blue)}.range-value{min-width:49px;text-align:right;font-weight:700;color:var(--navy);font-size:14px}.help-text{font-size:12px;color:var(--muted);margin-top:5px}
.check-line{display:flex;align-items:flex-start;gap:9px;font-size:13px;color:#334155}.check-line input{margin-top:4px;accent-color:var(--blue)}.target-size-row{display:grid;grid-template-columns:1fr 105px;gap:10px}.notice{border-radius:8px;background:#f0f6ff;color:#234675;padding:11px 12px;font-size:12px}
.main-actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:22px}.main-actions .btn{flex:1 1 170px;min-height:46px}
.progress-wrap{display:none;margin-top:17px}.progress-wrap.visible{display:block}.progress-text{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--muted);margin-bottom:7px}.progress-track{height:8px;border-radius:20px;overflow:hidden;background:#e2e8f0}.progress-bar{height:100%;width:0;background:var(--blue);transition:width .2s}
.result-summary{display:none;margin-top:20px;padding:15px;border:1px solid #bbf7d0;border-radius:10px;background:#f0fdf4}.result-summary.visible{display:block}.result-summary h3{margin:0 0 7px;font-size:16px;color:#166534}.result-numbers{display:flex;flex-wrap:wrap;gap:10px 24px;font-size:13px;color:#166534}
.error-message{display:none;margin-top:14px;padding:11px 13px;border:1px solid #fecaca;background:#fef2f2;color:#991b1b;border-radius:8px;font-size:13px}.error-message.visible{display:block}
.info-section{margin-top:38px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.info-card{border:1px solid var(--border);border-radius:12px;background:#fff;padding:19px}.info-card h3{margin:0 0 7px;color:var(--navy);font-size:16px}.info-card p{margin:0;color:var(--muted);font-size:13px}
footer{border-top:1px solid var(--border);background:#fff;text-align:center;color:var(--muted);font-size:12px;padding:22px}
@media(max-width:760px){main{padding:26px 13px 38px}.tool-shell{padding:15px}.panel-grid{grid-template-columns:1fr}.panel{min-height:auto;padding:17px}.info-section{grid-template-columns:1fr}.header-inner{padding:15px}.header-tagline{display:none}}
@media(max-width:420px){.two-columns{grid-template-columns:1fr}.main-actions{flex-direction:column}.main-actions .btn{flex-basis:auto;width:100%}.image-item{grid-template-columns:48px minmax(0,1fr) auto;gap:8px}.image-thumb{width:48px;height:48px}}
Fast Image Compression
Compress multiple images in one session using your browser, without uploading them to a server.
Flexible Settings
Choose image quality, maximum dimensions, output format, and an optional target file size.
Easy Downloads
Download each processed image individually or bundle all successful results into a ZIP file.
(() => {
"use strict";
const $ = id => document.getElementById(id);
const fileInput=$("fileInput"),dropZone=$("dropZone"),imageList=$("imageList"),qualityInput=$("quality"),maxWidthInput=$("maxWidth"),maxHeightInput=$("maxHeight"),formatInput=$("format"),targetSizeInput=$("targetSize"),targetUnitInput=$("targetUnit");
let files=[],nextId=1,busy=false;
$("year").textContent=new Date().getFullYear();
function formatBytes(bytes){if(!Number.isFinite(bytes)||bytes<0)return"0 KB";if(bytes<1024)return bytes+" B";if(bytes<1024*1024)return(bytes/1024).toFixed(1)+" KB";return(bytes/(1024*1024)).toFixed(2)+" MB"}
function safeBaseName(name){return name.replace(/\.[^.]+$/,"").replace(/[:"/\\|?*\x00-\x1F]/g,"_").trim()||"compressed-image"}
function outputExtension(mime){return mime==="image/png"?"png":mime==="image/webp"?"webp":"jpg"}
function getOutputMime(file){const selected=formatInput.value;if(selected==="original")return["image/jpeg","image/png","image/webp"].includes(file.type)?file.type:"image/jpeg";return selected}
function getTargetBytes(){const amount=Number(targetSizeInput.value);if(!amount||amountsum+item.file.size,0);
$("fileCount").textContent=count+(count===1?" image selected":" images selected");$("originalSize").textContent="Original: "+formatBytes(originalBytes);
const completed=files.filter(item=>item.blob),compressedBytes=completed.reduce((sum,item)=>sum+item.blob.size,0),completedOriginal=completed.reduce((sum,item)=>sum+item.file.size,0);
const savedPercent=completedOriginal>0?((completedOriginal-compressedBytes)/completedOriginal*100):0;
$("resultCount").textContent="Images: "+completed.length;$("resultOriginal").textContent="Original: "+formatBytes(completedOriginal);$("resultCompressed").textContent="Compressed: "+formatBytes(compressedBytes);$("resultSaved").textContent="Saved: "+savedPercent.toFixed(1)+"%";
$("resultSummary").classList.toggle("visible",completed.length>0);$("downloadBtn").disabled=completed.length===0||busy;$("downloadZipBtn").disabled=completed.length===0||busy;$("compressBtn").disabled=busy||count===0;$("browseBtn").disabled=busy;$("clearBtn").disabled=busy;
}
function renderList(){
imageList.innerHTML="";
if(!files.length){imageList.innerHTML='
Your selected images will appear here.
';updateSummary();return}
for(const item of files){
const row=document.createElement("div");row.className="image-item";
const img=document.createElement("img");img.className="image-thumb";img.alt="";img.src=item.previewUrl;
const info=document.createElement("div");info.style.minWidth="0";
const name=document.createElement("div");name.className="image-name";name.textContent=item.file.name;
const meta=document.createElement("div");meta.className="image-meta";meta.textContent=formatBytes(item.file.size);
const status=document.createElement("div");status.className="image-status";status.textContent=item.blob?"Compressed · "+formatBytes(item.blob.size):item.error?"Failed: "+item.error:"Ready to compress";
info.append(name,meta,status);
const remove=document.createElement("button");remove.className="remove-btn";remove.type="button";remove.title="Remove image";remove.setAttribute("aria-label","Remove "+item.file.name);remove.textContent="×";remove.disabled=busy;remove.addEventListener("click",()=>removeFile(item.id));
row.append(img,info,remove);imageList.appendChild(row);
}
updateSummary();
}
function addFiles(selectedFiles){
if(busy)return;setError("");const allowed=["image/jpeg","image/png","image/webp"],rejected=[];let added=0;
for(const file of selectedFiles){
const extensionOkay=/\.(jpe?g|png|webp)$/i.test(file.name);
if(!allowed.includes(file.type)&&!extensionOkay){rejected.push(file.name);continue}
if(files.some(item=>item.file.name===file.name&&item.file.size===file.size&&item.file.lastModified===file.lastModified))continue;
files.push({id:nextId++,file,previewUrl:URL.createObjectURL(file),blob:null,outputName:"",error:""});added++;
}
if(rejected.length)setError("Unsupported file type: "+rejected.slice(0,3).join(", ")+(rejected.length>3?" and more.":". Please select JPG, PNG or WebP images."));
else if(!added&&selectedFiles.length)setError("No new images were added. The selected files may already be in the list.");
renderList();
}
function removeFile(id){if(busy)return;const item=files.find(file=>file.id===id);if(item)URL.revokeObjectURL(item.previewUrl);files=files.filter(file=>file.id!==id);renderList()}
function clearAll(){if(busy)return;files.forEach(item=>URL.revokeObjectURL(item.previewUrl));files=[];fileInput.value="";setError("");$("resultSummary").classList.remove("visible");hideProgress();renderList()}
function loadImage(file){return new Promise((resolve,reject)=>{const url=URL.createObjectURL(file),img=new Image();img.onload=()=>{URL.revokeObjectURL(url);resolve(img)};img.onerror=()=>{URL.revokeObjectURL(url);reject(new Error("This image could not be opened."))};img.src=url})}
function getDimensions(width,height){const maxWidth=Number(maxWidthInput.value),maxHeight=Number(maxHeightInput.value),validWidth=maxWidth>0?maxWidth:Infinity,validHeight=maxHeight>0?maxHeight:Infinity,scale=Math.min(1,validWidth/width,validHeight/height);return{width:Math.max(1,Math.round(width*scale)),height:Math.max(1,Math.round(height*scale))}}
function canvasToBlob(canvas,mime,quality){return new Promise((resolve,reject)=>{canvas.toBlob(blob=>blob?resolve(blob):reject(new Error("The browser could not encode this image.")),mime,quality)})}
async function encodeImage(canvas,mime,initialQuality,targetBytes){
if(mime==="image/png")return canvasToBlob(canvas,mime);
let low=.05,high=Math.max(.05,Math.min(1,initialQuality)),best=await canvasToBlob(canvas,mime,high);
if(!targetBytes||best.size<=targetBytes)return best;
let smallest=best;
for(let i=0;i<7;i++){const middle=(low+high)/2,candidate=await canvasToBlob(canvas,mime,middle);if(candidate.size<smallest.size)smallest=candidate;if(candidate.size<=targetBytes){best=candidate;low=middle}else high=middle}
return best.size{item.blob=null;item.error=""});renderList();
let completed=0;const total=files.length;
try{
for(const item of files){setProgress(completed/total*100,"Compressing "+item.file.name+"...");try{await compressOne(item)}catch(error){item.error=error&&error.message?error.message:"Compression failed"}completed++;setProgress(completed/total*100,"Processed "+completed+" of "+total+" images");renderList();await new Promise(resolve=>requestAnimationFrame(resolve))}
const successes=files.filter(item=>item.blob).length;if(!successes)setError("No images could be compressed. Try another image or a different output format.");else if(files.some(item=>item.error))setError("Some images could not be compressed. Successful images are available to download.");
}finally{busy=false;renderList();updateSummary();$("compressBtn").disabled=files.length===0;$("browseBtn").disabled=false;$("clearBtn").disabled=false;$("progressLabel").textContent="Compression finished";$("progressPercent").textContent="100%";$("progressBar").style.width="100%"}
}
function downloadBlob(blob,filename){const url=URL.createObjectURL(blob),anchor=document.createElement("a");anchor.href=url;anchor.download=filename;document.body.appendChild(anchor);anchor.click();anchor.remove();setTimeout(()=>URL.revokeObjectURL(url),1500)}
async function downloadIndividually(){if(busy)return;const completed=files.filter(item=>item.blob);if(!completed.length){setError("Compress your images before downloading.");return}setError("");for(let i=0;isetTimeout(resolve,250))}}
async function downloadZip(){
if(busy)return;const completed=files.filter(item=>item.blob);if(!completed.length){setError("Compress your images before downloading.");return}
if(typeof JSZip==="undefined"){setError("The ZIP library could not load. Check your internet connection, then reload the page or use the individual Download button.");return}
$("downloadZipBtn").disabled=true;$("downloadBtn").disabled=true;setError("");
try{const zip=new JSZip(),usedNames=new Set();for(const item of completed){let filename=item.outputName,index=2;while(usedNames.has(filename.toLowerCase())){const dot=item.outputName.lastIndexOf("."),stem=dot>=0?item.outputName.slice(0,dot):item.outputName,ext=dot>=0?item.outputName.slice(dot):"";filename=stem+"-"+index+++ext}usedNames.add(filename.toLowerCase());zip.file(filename,item.blob)}
const zipBlob=await zip.generateAsync({type:"blob"},metadata=>setProgress(metadata.percent,"Creating ZIP file..."));downloadBlob(zipBlob,"compressed-images.zip")
}catch(error){setError("Could not create the ZIP file. Please try the individual Download button.")}finally{updateSummary()}
}
$("browseBtn").addEventListener("click",event=>{event.stopPropagation();if(!busy)fileInput.click()});
dropZone.addEventListener("click",event=>{if(event.target.closest("button"))return;if(!busy)fileInput.click()});
dropZone.addEventListener("keydown",event=>{if((event.key==="Enter"||event.key===" ")&&!busy){event.preventDefault();fileInput.click()}});
fileInput.addEventListener("change",event=>{addFiles(Array.from(event.target.files||[]));fileInput.value=""});
["dragenter","dragover"].forEach(type=>dropZone.addEventListener(type,event=>{event.preventDefault();event.stopPropagation();if(!busy)dropZone.classList.add("dragover")}));
["dragleave","drop"].forEach(type=>dropZone.addEventListener(type,event=>{event.preventDefault();event.stopPropagation();dropZone.classList.remove("dragover")}));
dropZone.addEventListener("drop",event=>{if(!busy&&event.dataTransfer)addFiles(Array.from(event.dataTransfer.files||[]))});
document.addEventListener("dragover",event=>event.preventDefault());
document.addEventListener("drop",event=>{if(event.target!==dropZone&&!dropZone.contains(event.target)){event.preventDefault();if(!busy&&event.dataTransfer)addFiles(Array.from(event.dataTransfer.files||[]))}});
qualityInput.addEventListener("input",()=>$("qualityValue").textContent=qualityInput.value+"%");
$("compressBtn").addEventListener("click",compressAll);$("downloadBtn").addEventListener("click",downloadIndividually);$("downloadZipBtn").addEventListener("click",downloadZip);$("clearBtn").addEventListener("click",clearAll);
renderList();
})();
